But when the boy deleted the app, Nuri allegedly went to his home that same day, pushed him to the ground in the front yard and sexually assaulted him.

The teen's mother rushed to help him, prompting Nuri to allegedly run to his vehicle and drive away.

The boy was taken to hospital for examination.

Nuri, from Kellyville Ridge, was arrested on Sunday and charged with having sexual intercourse without consent.

The case has alarmed police who are warning parents about online safety, especially during the NSW school holidays when children tend to have more access to the internet.

They're recommending parents monitor the time children spend online and that they keep devices in a room accessible by the whole family, rather than a personal bedroom.

Parents should be able to access and randomly check their child's email and social media accounts and can check the family phone bill for unusual outgoing calls, police say.

"Spend time talking to your child about the dangers associated with online conversations, particularly when communicating with someone that they have only ever met online," NSW Police said in a statement.

Nuri was granted conditional bail when he first faced court on Monday.

His matter was on Thursday adjourned to Blacktown Local Court in mid-December.

The 40-year-old sat silent and alone in the court and didn't speak to media outside.